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Temporal-DHT and Its Application in P2P-VoD Systems

机译：Temporal-DHT及其在P2P-VOD系统中的应用

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Peer-to-Peer (P2P) based Video-on-Demand (VoD) streaming services are gaining popularity. Meanwhile, the technical barriers of P2P-VoD systems still exist because of asynchronous and dynamic user interactivity where any user can jump to random locations in the video stream along with the support for Fast-Forward/Fast-Backward operations. An important component to address these issues lies in efficient neighbor discovery mechanism for searching and receiving desired data in a peer-to-peer fashion with less burden of the server. We advocate a Distributed Hash Table (DHT) based overlay for efficient lookup with its desirable features of provable scalability, robustness and decentralization for supporting Internet-scale P2P applications. However, one big challenge associated with a DHT-based overlay is how to accommodate a large number of update operations with the continuous change of peers’ playing position. To solve this inadequacy, we propose a novel concept of temporal-DHT which exploits the temporal dynamics of the content to estimate the playing position of peers, thereby greatly reducing the update overhead. We also propose a new content management and discovery scheme by the skillful integration of: (1) random/out-of-order/static caching to support interactive operations and (2) playing/in-order/dynamic caching to maintain streaming efficiency and playback continuity. Extensive simulation results demonstrate that our mechanism achieves low messaging overhead with high streaming quality for P2P-VoD systems in a dynamic environment where peers asynchronously join/leave the network.
机译：基于点对点（P2P）的视频点播（VOD）流服务是普及的。同时，由于异步和动态用户交互性，P2P-VOD系统的技术障碍仍然存在，其中任何用户可以跳到视频流中的随机位置以及用于快进/快速后退操作的支持。解决这些问题的一个重要组成部分在于，用于以对等方式搜索和接收所需数据的有效邻居发现机制，其服务器负担较少。我们倡导基于分布式哈希表（DHT）的叠加层，以便有效查找，以其可提供可扩展性，鲁棒性和分散性的理想特征，用于支持互联网级P2P应用。然而，与基于DHT的叠加相关联的一个大挑战是如何能够使用对等体播放位置的连续变化的大量更新操作。为了解决这种不足，我们提出了一种新颖的临时DHT的概念，它利用内容的时间动态来估计对等体的播放位置，从而大大减少了更新开销。我们还通过熟练的集成提出了新的内容管理和发现方案：（1）随机/无序/静态缓存以支持交互式操作和（2）播放/按顺序/动态缓存以维护流效率和播放连续性。广泛的仿真结果表明，我们的机制在动态环境中为P2P-VOD系统中的高流量质量实现了低通讯开销，该系统异步地加入/离开网络。

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